US5440872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic method
Assignee: Individual
•
Filing: 1994-09-12
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Granted: 1995-08-15
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Expires: 2014-09-12
Abstract
Abstract A low emissions combustor for use in gas turbines which operate at turbine inlet temperatures below about 1250 degrees Kelvin, which comprises; a multiplicity of microlith catalyst elements; and means for providing an admixture of fuel and air having an adiabatic flame temperature within the range of 600 to 1250 degrees Kelvin.
Inventors
- 👤 William C. Pfefferle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:05
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01J; B01J12/00; B01J12/007; B01J19/00; B01J19/0093; B01J35/00; B01J35/50; B01J35/56; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; B01J37/34; B01J37/341; B01J37/347; F; F01; F01N; F01N13/00; F01N13/009; F01N13/0097; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; F01N3/2026; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/2825; F01N3/2835; F23; F23R; F23R3/00; F23R3/40; B01J2219/00; B01J2219/00781; B01J2219/00783; B01J2219/00819; B01J2219/00822; B01J2219/00824; B01J2219/00835; B01J2219/00873; F01N2330/00; F01N2330/06; F01N2330/10; F01N2330/12; F01N2330/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A low emissions combustor for use in gas turbines which operate at turbine inlet temperatures below about 1250 degrees Kelvin, which comprises; a multiplicity of microlith catalyst elements; and means for providing an admixture of fuel and air having an adiabatic flame temperature within the range of 600 to 1250 degrees Kelvin.
Claim 2
Dependent Claim
52 words
A low emissions combustor for use in gas turbines which operate at turbine inlet temperatures below about 1250 degrees Kelvin, which comprises; a multiplicity of microlith catalyst elements; and means for providing an admixture of fuel and air having an adiabatic flame temperature within the range of 600 to 1250 degrees Kelvin.
Claim 3
Dependent Claim
25 words
The combustor of claim 1 including means to preheat catalyst elements to a temperature effective to operate the catalyst element, prior to introduction of fuel.
Claim 4
Dependent Claim
20 words
The combustor of claim 2 wherein said preheating means allows preheating to a temperature of at least 600 degrees Kelvin.
Claim 5
Dependent Claim
12 words
The combustor of claim 2 wherein said combustor includes electrical preheating means.
Claim 6
Dependent Claim
11 words
The combustor of claim 1 wherein said fuel is a hydrocarbon.
Claim 7
Dependent Claim
10 words
The combustor of claim 5 wherein said fuel is gasoline.
Claim 8
Dependent Claim
19 words
The combustor of claim 1 wherein said catalyst elements comprise a precious metal coated on a microlith support structure.
Claim 9
Dependent Claim
14 words
The combustor of claim 7 wherein said precious metal coating is applied by sputtering.
Claim 10
Independent Claim
67 words
The method of operating gas turbines which operate at turbine inlet temperatures below 1250 degrees Kelvin, which comprises; providing an admixture of fuel and air having an adiabatic flame temperature between 600 and 1250 degrees Kelvin; passing said admixture through a combustor comprising a multiplicity of microlith catalyst elements; and reacting said fuel on said catalyst elements to produce water and carbon dioxide with liberation of heat.
Claim 11
Independent Claim
67 words
The method of operating gas turbines which operate at turbine inlet temperatures below 1250 degrees Kelvin, which comprises; providing an admixture of fuel and air having an adiabatic flame temperature between 600 and 1250 degrees Kelvin; passing said admixture through a combustor comprising a multiplicity of microlith catalyst elements; and reacting said fuel on said catalyst elements to produce water and carbon dioxide with liberation of heat.
Claim 12
Dependent Claim
25 words
The method of claim 9 wherein said combustor is heated electrically to a temperature effective to operate the catalyst elements, prior to introduction of fuel.
Claim 13
Dependent Claim
11 words
The method of claim 9 wherein said fuel comprises a hydrocarbon.
Claim 14
Dependent Claim
10 words
The method of claim 10 wherein said fuel is gasoline.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-14 | 1999-02-13 | 1999-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-14 | 2003-02-13 | 2003-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-14 | 2007-02-13 | 2007-08-15 | $7700.00 | Window Closed / Lapsed |